carbonium

詳細解釋：

car.bo.ni.um

n.（名詞）
An organic cation, such as H3C, having one less electron than a corresponding free radical and with positive charge localized on the carbon atom.
正碳，陽碳：一種有機陽離子，如H3C，碳原子上具有一個比相對應的原子團弱的電子，並有一正電子